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MB39A126WQN

DC/DC Converter IC for Charging Li-ion Battery

Fujitsu 

MB39A125/126

• MB39A126 : QFN-28

Pin No. Pin Name

1

N.C.

2

GND

3

+INC2

4

N.C.

5

−INC2

6

OUTC2

7

+INE2

8

−INE2

9

ACOK

10

VREF

11

ACIN

12

−INE1

13

+INE1

14

OUTC1

15

N.C.

16

SEL

17

−INC1

18

N.C.

19

+INC1

20

CTL

21

FB123

22

−INE3

23

RT

24

XACOK

25

VH

26

OUT

27

VCC

28

CS

I/O

Description

⎯ No connection

⎯ Ground terminal

I Current detection amplifier (Current Amp2) non-inverted input terminal

⎯ No connection

I Current detection amplifier (Current Amp2) inverted input terminal

O Current detection amplifier (Current Amp2) output terminal

I Error amplifier (Error Amp2) non-inverted input terminal

I Error amplifier (Error Amp2) inverted input terminal

AC adapter voltage detection block (AC Comp.) output terminal

O ACOK = L when ACIN = H, ACOK = Hi-Z when ACIN = L,

ACOK = Hi-Z when CTL = L

O Reference voltage output terminal

I AC adapter voltage detection block (AC Comp.) input terminal

I Error amplifier (Error Amp1) inverted input terminal

I Error amplifier (Error Amp1) non-inverted input terminal

O Current detection amplifier (Current Amp1) output terminal

⎯ No connection

Charge voltage setting switch terminal (3cells or 4cells) .

I SEL terminal “H” level : Charge voltage setting 16.8 V (4cells)

SEL terminal “L” level : Charge voltage setting 12.6 V (3cells)

I Current detection amplifier (Current Amp1) inverted input terminal

⎯ No connection

I Current detection amplifier (Current Amp1) non-inverted input terminal

Power supply control terminal

I Setting the CTL terminal at “L” level places the IC in the standby

mode.

O Error amplifier (Error Amp1, 2, 3) output terminal

I Error amplifier (Error Amp3) inverted input terminal

⎯ Triangular wave oscillation frequency setting resistor connection terminal

AC adapter voltage detection block ( AC Comp.) output terminal

O XACOK = Hi-Z when ACIN = H, XACOK = L when ACIN = L,

XACOK = Hi-Z when CTL = L

O Power supply terminal for FET drive circuit (VH = VCC - 6 V)

O External FET gate drive terminal

⎯

Power supply terminal for reference voltage, control circuit, and output cir-

cuit

⎯ Soft-start setting capacitor connection terminal

10

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